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Experimental first order reversal curves (FORC) on Ising and Heisenberg spin glasses

Experimental first order reversal curves (FORC) on Ising and Heisenberg spin glasses. Didier Hérisson, Michael Östh and Per Nordblad Uppsala University. Hysteresis loops on spin glasses. Au(Fe) – E.I. Kondorski et al. (1973). Cu(Mn)-P. Monod et al. (1979).

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Experimental first order reversal curves (FORC) on Ising and Heisenberg spin glasses

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  1. Experimental first order reversal curves (FORC) on Ising and Heisenberg spin glasses Didier Hérisson, Michael Östh and Per Nordblad Uppsala University

  2. Hysteresis loops on spin glasses Au(Fe) – E.I. Kondorski et al. (1973) Cu(Mn)-P. Monod et al. (1979) (From Spin Glasses, R. Rammal and J. Souletie, notes from a course at Grenoble in 1981)

  3. What can one learn from the hysteresis behaviour using FORCs? The FORC distribution gives a visualisation of switching events Comparison with ’related’ systems Distinguishes an in-field SG phase from no in-field SG phase?

  4. Roberts et al. J. Geophys. Res. 105, 28461 (2000) The FORC method

  5. Construction of the FORC distribution

  6. FORC distributions C.R. Pike et al. Geophys. J. Int. 145, 721 (2001) b) Weakly interacting nanoparticles c) Floppy disc. d) nanoparticles

  7. Monte Carlo 2d-EASG H. G. Katzgraber et al. Phys. Rev. Lett. 85, 257202 (2002)

  8. 3D FORC distribution plot from MC-simulations of a 2d Ising EASG H.G. Katzgraber et al.

  9. ZFC-FC-TRM H=0.1 Oe Ag(Mn) FMTO

  10. Hysteresis of Ag(Mn) and Fe0.5Mn0.5TiO3

  11. M (arb.units.) FORC FMTO

  12. FORC distribution FMTO

  13. FORCs Ag(Mn)

  14. FORC distribution Ag(Mn)

  15. 3D FORC Ag(Mn)

  16. Comparison FMTO Ag(Mn)

  17. Conclusions Remarkably different hysteresis behaviour for Ising (strongly anisotropic) and Heisenberg spin glasses. The FORCs of FMTO shows similarities with weakly interacting nanoparticle systems with wide distributions of particle sizes. The Ag(Mn) system yields unique FORC distributions with a very sharp structure at a rather weak negative bias field and low coercivity…… Supportive of other experimental indications suggesting in-field SG transitions in weakly anisotropic systems?

  18. FeAgW – mechanically alloyed

  19. FeAgW - FORC FeAgW c.f. FMTO

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